Spring 的IoC使用示例3

下面来展示一个在Spring中把相同的部分提取出来配置好，可以被多个类继承而注入到它们的引用里。

1.程序的总体结构图：



2_1. bean1.java的代码如下：

package com.my_spring;

public class Bean1 {

private Bean2 bean2;
private Bean3 bean3;
private Bean4 bean4;

public Bean2 getBean2() {
return bean2;
}
public void setBean2(Bean2 bean2) {
this.bean2 = bean2;
}
public Bean3 getBean3() {
return bean3;
}
public void setBean3(Bean3 bean3) {
this.bean3 = bean3;
}
public Bean4 getBean4() {
return bean4;
}
public void setBean4(Bean4 bean4) {
this.bean4 = bean4;
}
}

2_2. bean2.java的代码如下：

package com.my_spring;

public class Bean2 {
private int id;
private String name;
private String password;

public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
}

2_3. bean3.java的代码如下：

package com.my_spring;

public class Bean3 {
private int id;
private String name;

public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
}

2_4. bean4.java的代码如下：

package com.my_spring;

public class Bean4 {
private int age;

public int getAge() {
return age;
}

public void setAge(int age) {
this.age = age;
}
}

3.测试类InjectionTest.java的代码如下：

package com.my_spring;

import org.springframework.beans.factory.BeanFactory;
import org.springframework.context.support.ClassPathXmlApplicationContext;

import junit.framework.TestCase;

public class InjectionTest extends TestCase {

BeanFactory factory;

@Override
protected void setUp() throws Exception {
factory = new ClassPathXmlApplicationContext("applicationContext.xml");
}

public void testInjection() {
Bean1 bean1 = (Bean1)factory.getBean("bean1");

System.out.println("bean1.bean2.id=" + bean1.getBean2().getId());
System.out.println("bean1.bean2.name=" + bean1.getBean2().getName());
System.out.println("bean1.bean2.password=" + bean1.getBean2().getPassword());
System.out.println("bean1.bean3.id=" + bean1.getBean3().getId());
System.out.println("bean1.bean3.id=" + bean1.getBean3().getName());
System.out.println("bean1.bean4.age=" + bean1.getBean4().getAge());
}
}

4.Spring的配置文件applicationContext.xml的代码如下：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:p="http://www.springframework.org/schema/p"
xmlns:context="http://www.springframework.org/schema/context"
xmlns:aop="http://www.springframework.org/schema/aop"
xmlns:tx="http://www.springframework.org/schema/tx"
xmlns:dwr="http://www.directwebremoting.org/schema/spring-dwr"
xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.2.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop-3.2.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.2.xsd"> 
<bean id="bean1" class="com.my_spring.Bean1">
<property name="bean2" ref="bean2" />
<property name="bean3">
<ref bean="bean3"/>
</property>
<property name="bean4" ref="bean4" />
</bean>

<bean id="bean2" class="com.my_spring.Bean2">
<property name="id" value="1111" />
<property name="name">
<value>木星人</value>
</property>
<property name="password" value="123" />
</bean>
<bean id="bean3" class="com.my_spring.Bean3">
<property name="id" value="1111" />
<property name="name">
<value>木星人</value>
</property>
</bean>

<!-- bean2和bean3可以通过提取共有属性使用下面注释部分的形式来表示 -->
<!-- <bean id="beanAbstract" abstract="true">
<property name="id" value="1111" />
<property name="name">
<value>木星人</value>
</property>
</bean>
<bean id="bean2" class="com.my_spring.Bean2" parent="beanAbstract">
<property name="password" value="123" />
</bean>
<bean id="bean3" class="com.my_spring.Bean3" parent="beanAbstract" /> -->

<bean id="bean4" class="com.my_spring.Bean4">
<property name="age" value="22" />
</bean>
</beans>

5.程序运行结果截图:



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